Peteski's right. Replicas of US money are fine, as long as they are obviously fake, such as the bills printed with "MOVIE USE ONLY" across them. Oddly, people still try to spend them, and businesses still take them.
Of course, at my previous job, one of our customer banks had a habit of accepting business licenses as checks, cashing them, and wanting us to process them. We couldn't, of course, because they had to routing numbers, or account numbers, or any other "check" data. We just sent them back... Apparently there were several people in that little town with access to unneeded(?) business licenses.
